ANNULAR DRILL Russian patent published in 2003 - IPC

FIELD: tools for working different-viscosity materials, particularly bony tissues in traumatology and orthopedics. SUBSTANCE: annular drill includes body with stem in the form of hollow member of revolution having cutting teeth onto working end. Working end is in the form of crown with inner cavity in the form of widened truncated cone for moving core into cavity of stem. Diameter of cavity opening is equal to maximum diameter of truncated cone. Cutting teeth are arranged in such a way that crown cuts-in to worked surface without sliding at feeding inclined tool to worked plane. EFFECT: enlarged technological possibilities at making operations on bony tissue while collecting removed material inside tool. 3 cl, 5 dwg